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2024-05-21 Upgrading Python and Django.

We will update python to version 3.11 and Django to version 4.2

First install python 3.11

Reference How to Install an Alternate Python Version

1. Enable deb-src packages in the source lists.

sudo cp /etc/apt/sources.list /etc/apt/sources.list.backup
sudo vim /etc/apt/sources.list

Uncomment all lines with deb-src. Use search and replace in vim: :%s/^# deb-src/deb-src

Save the file and update apt

sudo apt update
sudo apt upgrade

2. Install all build dependencies

sudo apt-get build-dep python3
sudo apt-get install build-essential gdb lcov pkg-config \
      libbz2-dev libffi-dev libgdbm-dev libgdbm-compat-dev liblzma-dev \
      libncurses5-dev libreadline6-dev libsqlite3-dev libssl-dev \
      lzma lzma-dev tk-dev uuid-dev zlib1g-dev libmpdec-dev

3. Download the source tarball and unzip

cd ~/downloads
wget https://www.python.org/ftp/python/3.11.9/Python-3.11.9.tgz
tar -xvvf Python-3.11.9.tgz

4. Build, Test, and then install the new Python version

cd ~/downloads/Python-3.11.9
./configure
make
make test
sudo make altinstall

Check that python3.11 is installed

$ python3.11 -V
Python 3.11.9

5. Delete the old venv and make a new one with Python3.11

The venv for aslcv2_be is stored in /usr/local/src/env/aslcv2_be. The code is installed at /usr/local/src/aslcv2_be.

Make sure all environment variables have been moved out of the venv activation script and saved in /usr/local/src/aslcv2_be/.env. Compare the output of the following commands.

tail -n 20 /usr/local/src/env/aslcv2_be/bin/activate
cat /usr/local/src/aslcv2_be/.env

If all environment variables are correctly saved, go to the environment directory.

cd /usr/local/src/env
ls -l 
rm -r aslcv2_be
python3.11 -m venv aslcv2_be

6. Pull the latest version and install the updated requirements.txt in the new environment with pip

cd /usr/local/src/aslcv2_be
git pull origin master
source ../env/aslcv2_be/bin/activate
pip install --upgrade pip
pip install wheel
pip install -r requirements.txt

7. Run migrations, collectstatic and restart aslcv2_be services

cd /usr/local/src/aslcv2_be
source /usr/local/src/env/aslcv2_be/bin/activate
./manage.py migrate
./manage.py collectstatic --settings config.settings.production
./re_aslcv2_be